Are you tired of hearing every small noise in your house? Does your restroom echo when someone is in their taking a shower or blow drying their hair? Do you get irritated when your laundry room noise fills the whole entire house and even your neighbors can hear that you are doing laundry? Well, this is when you know that you should sound proof your rooms in your house or at least lessen the noise in your house.
First thing you should do it have all the electrical wiring and plumbing in place in the walls in the room where you are going to soundproof. Hang drywall on one side of all the stud walls of the room to be soundproofed, so that the room is closed in but you still have access to the interiors of the walls. (The side you choose to leave open will vary - you want to leave open the side that will offer the easiest access to apply the soundproofing material.)
Then, apply fiberglass insulation batting to the walls. The batts can be packed in fairly tightly - the denser the material, the more sound you stop. But remember that for actual insulation purposes, the insulation loses value if it's too tightly packed. Hang the drywall as usual. If you are unsure about how to go about with this then you should call in a professional insulation company and have it blow in foam or paper fiber insulation that adheres to the construction and provides both great sound deadening and a high insulation value. Hang the drywall as usual once the soundproofing is applied. Or you can hang manufactured soundproofing wall coverings like Pyrotek or Super Soundproofing products that are sold as rigid panels or in rolls. You can purchase these at home improvement stores, lumberyards, insulation contractors or drywall supply houses. You should hang these covering according to the manufacturer's directions, then hang the drywall as usual.
You should always wear goggles and a dust mask while doing this even though it is not toxic the insulation products can be mildly irritating. You should not overfill the walls with insulation or you will have problems when you are going to put up the drywall or other wallboard coverings.
After all that is done you should remove the drywall from one side of the walls to be soundproofed. (strip the side of the wall that strikes a balance between offering the most work space and causing the least amount of damage.)
Then cut small holes in the drywall near the ceiling between the studs. Fill in the space between the drywall with blow in paper or expandable foam insulation. You can rent this machine at most lumberyards or rental centers, or where you purchase your materials. This expandable foam can be purchased in a small looking spray can or large container that looks like a propane tank for a barbecue grill. After this step you should patch and refinish the drywall.
Or you can hang manufactured wall covering materials over the existing walls (as opposed to behind the drywall). Many come in a variety of colors or are paintable (you'll pay more for the "finished" products than you will for the kind that go on behind the drywall). These products take up very little space and work well. Choose from panels, acoustic matting and vibration barriers.
Remember: Be very careful when blowing in soundproofing material. You can overfill the walls and cause severe, expensive damage. Call in a professional insulation company to avoid overfilling and causing severe damage to walls.